Human physiology worksheet with answers

Free printable Human physiology worksheet: 8 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy

Which ion triggers contraction by binding to troponin in skeletal muscle?

  1. AChloride
  2. BSodium
  3. CCalcium
  4. DPotassium
2.Easy

Which part of the nervous system is responsible for the "fight or flight" response?

  1. ASomatic nervous system
  2. BSympathetic nervous system
  3. CEnteric nervous system
  4. DParasympathetic nervous system
3.Easy

Which enzyme in saliva starts the digestion of starch?

  1. ASalivary amylase
  2. BLipase
  3. CPepsin
  4. DTrypsin
4.Medium

What is the main effect of aldosterone on the kidney?

  1. AIncreased filtration in the glomerulus
  2. BWater reabsorption by inserting aquaporins only
  3. CGlucose reabsorption in the proximal tubule
  4. DSodium reabsorption and potassium secretion in the distal nephron
5.Medium

Why can cardiac muscle not be tetanised like skeletal muscle?

  1. AIts long refractory period lasts almost as long as the contraction
  2. BIt is not striated
  3. CIt has no calcium in the sarcoplasmic reticulum
  4. DIt is controlled only by hormones
6.Medium

Which cells in the stomach secrete hydrochloric acid?

  1. AGoblet cells
  2. BG cells
  3. CParietal cells
  4. DChief cells
7.Hard

A patient hyperventilating during a panic attack has tingling fingers. What would the arterial blood gas most likely show?

  1. ALow pH and high PaCO₂
  2. BHigh pH and low PaCO₂
  3. CHigh pH and high bicarbonate
  4. DLow pH and low bicarbonate
8.Hard

In Otto Loewi's classic experiment, fluid from a vagus-stimulated frog heart slowed a second heart. What did this show?

  1. AThe vagus nerve speeds up the heart
  2. BNerves pass signals to their targets by releasing a chemical
  3. CThe heart beats without any nerve supply
  4. DNerve impulses spread through the fluid directly as electricity

Answer key

  1. 1. C · Calcium
  2. 2. B · Sympathetic nervous system
  3. 3. A · Salivary amylase
  4. 4. D · Sodium reabsorption and potassium secretion in the distal nephron
  5. 5. A · Its long refractory period lasts almost as long as the contraction
  6. 6. C · Parietal cells
  7. 7. B · High pH and low PaCO₂
  8. 8. B · Nerves pass signals to their targets by releasing a chemical

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